#include <stdio.h>

int main(){
	int x = 10;
	int* p1 = &x;//有效指针
	int *p2 = NULL;//NULL是空地址，值是0
	int * p3;//随机地址，野指针
	printf("x=%d,*p1=%d \n",x,*p1);
	printf("x=%p,p1=%p \n",&x,p1);
}
